The descriptions and dimensions are confusing as all get out. Seems to be no standard to anything. You must do the math and know exactly what you need to be able to find one with the right numbers to fit. Very very few places to buy a custom fit front end.

Now as we typically are building our own frames to no standard production dimensions the front end will have to be custom to it to be totally correct. Even though it may be possible to get there with carefully researched and fitted bought parts. Especially if you use all aftermarked harley parts as there is a large aftermarket for them.

By a large amount the most common front suspension for a hand built trike is a hand built leading link. It also is one of the easiest to build in a hobby shop in the garage.